/Engine/Source/Runtime/UMG/Public/Blueprint/UserWidget.h
Called when the user is dropping something onto a widget. Ends the drag and drop operation, even if no widget handles this.
'true' to indicate you handled the drop operation.
bool OnDrop ( [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) MyGeometry, [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) PointerEvent, [UDragDropOperation](API\Runtime\UMG\Blueprint\UDragDropOperation) * Operation )